Double-drum hoist



E. B. LEAR DOUBLE DRUM HOIST Filed March 19, 1926 Sept. 7 1926.

Vs A IN VEN TOR 15 ATRNEY Patented Sept. 7, 1925.

EARL

B. LEAR, orrnrnnrrsnune, new annsnrnssrenon romeERsoLL-nANn oo vr- PANY, or JERSEY orry, NEW J'nasEY, aoonronarroir or :unw'annsnyf DOUBL -Dania Boxer.

7 Application filed March 19, 1926; Serial No. 95,942.

This invention relates to hoists, but more particularly to hoists oflthe double drum type in which a, common driving elementj may be selectively connectedto drive either of the drums. 1 i

The ob ects driving element and either of the drums, and to insure full contact between the pawl and the cooperative engaging members car ,ried; bv the drums.

Other-objects will be impart obvious and y in in part pointed out hereinafter. I

The invention consists of the v combination of eleinents'and arrangement of parts substantially as described hereinafter and more specifically pointed out in the ap pended claims and illustrated int-he accompanying drawings, in which tion, of a double drum hoist,

- Figure 2 is a transverse view taken through Figure 1 on the line 2*2 looking in the direction of the arrows, and

Figurev '3 is i a plan view, partly in section, taken through Figure 1 on 1118.11119- 3-3 looking in the direction'of the ar-' rows. Referring tothe drawings, the hoist designated generally by A comprises a base plate B on opposite ends of which are mounted and frames C and D. Theend frames C and D are preferably for nied as separate. pieces and secured to the baseplate in any suitable and convenient manner. 1 In the present instance a motor E is supported by the end frame C and is intended to be connected to rotate a driving shaft F extending longitudinally of the hoist and supported at its opposite end by the frame D. The motor E may. be of any suitable reversible type, in the present instance. a pressure fluid motor is indicated. Accordingly, a valve chest G is provided for the motor to receive a pres sure fluid controlling valve H provided with a suitable throttle lever J whereby said valve may be actuated.

Encirclingthe driving shaft F is a center bearing K-supported at its ends by the end frames C and I), The center bearing is preferably secured to the end frames by suitable screws L, thus imparting rigidity ,to the said end frames and also forming a support for a haulage drum 0 and a tail of the invention are to insure quick and positive connection between; the

Figure 1 is an elevation, partly in secrope drum Poupon which are wound the ends of a haulage rope or cableQ."

- lnthepresent instance a bushing R .en-

circles the center bearing K to form a bearing at one end ofthe haulage drum 0.

The other end of the bushingR serves asa bearing for a sleeve Scarrying at one endinternal gear *T-and atits opposite end a main driver U secured to the -sleeves as by means of, keys V. I

Suitable means are provided forpoperw .tirely connecting thedrivingshaft F with the internal gear T for rotating the. main driver ii. To that end a pinion W is keyed to'one end of, the driving'shaft F, and meshes withanintermediate gear'X freely rotatable on-ashaft .Y; The shaft Y is preferably supported at am nd by the. end frame D and' at its'other end infa cover Zsecured to thesideof a gear. casing b', which may be formedintegrally with the end frame D.

A pinionc preferably; formed integrally h t te med ate: s a .X,.- S i wn,

meshes withtheinternal gear T and is -re'-.,

cessed to receive ,ai frictionless bearing (Z mounted on the shaft Y.

the main driver U is provided with an arm orextension 6 extending. between the. drums O and P and has formed near its outer er of the slots f and carries on'its side faces teeth h and j. The slot 7 is formed transversely in a plane offset from and parallel so" In accordancewith the present invention, 1

to the axis of the drivingshaft so that the pawl 9 may oscillate through a'plane parallel to the axis of rotation of the main. driver U. In the present instance the Jawl the teeth h and j are preferably tapered or backed off to insure positive and full engagement with cooperating teeth q and 1' preferably formed integrally with the dru'ms, O and P respectively. The cooperating face:

of the teeth 9 and r are also tapered to correspond to the tapers of the teeth 7 and formed on the pawl.

g is pivoted near oneend on a pin 70 having Any suitable means may be provided for checking rotationof the drums during the operation of the hoist or for preventing rotation thereof after the drums are disconnected from the driving element, Inthe present instance, brake bands t are arranged to encircle flanges u carried by the drums Q and P and are operativ-ely connected to shafts 4) provided with suitable levers w whereby the brake bands 25 may be manipulated. However. since the braking element forms no part of the present invention and inasmuch as its operation and functioning is well understood, further description thereof is considered unnecessary;

' In" the operation of the hoist let it be assinned that it is intended to rotate the tail rope drum P for winding up the cable Q. The valve H may then be'actuated to the position 'for actuating the motor in the required direction, in this instance, in a clockwise direction. The 'main driver U will "then, dueit o the train of gearing which conthe opposite direction for rotating the haulage drum 0. Reversal of the 'main driver "Willcause the pawl f to be forced out of enage-neat with the tail rope drum by the teeth 7" and to be simultaneously connected with the teeth g carried by the haulage drum 0.

I claim 1. In a hoist, the combination of a reversible motor, a driving shaft connected to be rotated by the motor, a pair of drums rotatable about the driving shaft, a main driver connected to'be rotated about the driving shaft, a pawl carried by the main driver to connect one or the other of the drums with the said main driver, and means carried by the main driver ea'ztending tra svers'ely of the axis of the driving shaft for pivoting the pawl to the main driver, the pawl oscillating in a plane offset from and parallel to the axis of rotation.

2.'In a hoist, the combination of a reversible motor, a driving shaft connected tobe rotated by the motor, a pair of drums rotatable about the drivingshatt, a main I driver between the drums and connected to be rotated bf, the driving shaft, aslot in the main driv r, an oscillatory; pawl in the slot to connect one or the other of the drains with the main driver, and a pin serewed'into the main driver to extend through one end of the pawl to form a pivot therefor said pin extending transversely totheaxis of the driving; shaft,'the pawl oscillatingin' a plane offset from and parallel to the axis of rotation. r

In testimony whereof I have signed this specification.

EARL B. LEAR, 

